Additional location in gitlab's nginx

Hello.
Gitlab installed with certbot on Centos 7 and works fine with address https://gitlab.website.com.

I have other service listening other port on same host (http://10.21.122.103:18080), and want to add the additional location option to nginx config to do something like https://gitlab.website.com/otherservice

I added additional custom config file with this code below, but it didn’t work.

location /otherservice {
            proxy_pass http://10.21.122.103:18080;
            proxy_pass_header  Authorization;
            proxy_pass_header X-WEBAUTH-USER;
    }